flipping coin program

[nathan gibson]

/**
 * Write a description of class HeadsOrTailsV1 here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import java.util.Scanner;
public class HeadsOrTailsV1
{
  public static void main(String [] args)
    {
        Scanner in;
        in = new Scanner(System.in);
        
        System.out.println("Enter the number of flips: ");
        int numberOfFlips = in.nextInt();
        System.out.println("\n");
        
        double randomNumber = 0;
        int counter = 0;
        
         while(counter < numberOfFlips)
        {
            
            randomNumber = Math.random();
            counter ++;
            
            
            boolean isTails = randomNumber > .5;
            
            if (isTails) 
                System.out.print("\nT " + randomNumber);
            else
                System.out.print("\nH " + randomNumber);
            
            
        }
       
      
        
    }
}
 

i have been working on this code that tells that gives a random number and interprets it as a heads or tail on a coin and therefore predicts the probability of a 50/50 chance. the only problem is that i need to add something to the code to where it will automatically tell me how many heads and how many tells it returns. thank you in advance for any help.

[Miklos Szeles]

Hi Nathan,

You can use a variable for example headCount and increment it every time a head is flipped. With this and the flip count you know the number of heads and tails.

[nathan gibson]

i think i get what you are saying, but my problem is that i really dont know how to translate that into code that will work with my program. im a beginner, sorry.

[Miklos Szeles]

No problem, we are here to help beginners.

You can do this like this:

/**
 * Write a description of class HeadsOrTailsV1 here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import java.util.Scanner;
public class HeadsOrTailsV1
{
  public static void main(String [] args)
    {
        Scanner in;
        in = new Scanner(System.in);
        
        System.out.println("Enter the number of flips: ");
        int numberOfFlips = in.nextInt();
        int numberOfHeads = 0;
        System.out.println("\n");
        
        double randomNumber = 0;
        int counter = 0;
        
         while(counter < numberOfFlips)
        {
            
            randomNumber = Math.random();
            counter ++;
            
            
            boolean isTails = randomNumber > .5;
            
            if (isTails)  {
                System.out.print("\nT " + randomNumber);
            }
            else {
                numberOfHeads++;
                System.out.print("\nH " + randomNumber);
            }
            
            
        }
       
      
        
    }
}
 

[nathan gibson]

 

 /** 
  * Write a description of class HeadsOrTailsV1 here. 
  *  
  * @author (your name)  
  * @version (a version number or a date) 
  */  
 import java.util.Scanner;  
 public class HeadsOrTailsV1  
 {  
   public static void main(String [] args)  
     {  
         Scanner in;  
         in = new Scanner(System.in);  
           
         System.out.println("Enter the number of flips: ");  
         int numberOfFlips = in.nextInt();  
         int numberOfHeads = 0;  
         int numberOfTails = numberOfFlips - numberOfHeads;
         System.out.println("\n");  
           
         double randomNumber = 0;  
         int counter = 0;             
          while(counter < numberOfFlips)  
         {  
               
             randomNumber = Math.random();  
             counter ++;  
               
               
             boolean isTails = randomNumber > .5;  
               
             if (isTails)  {  
                 System.out.print("\nT " + randomNumber);  
                 numberOfTails++;
                 System.out.println("\nNumber of Tails: " + numberOfTails);
             }  
             else {  
                 numberOfHeads++;  
                 System.out.print("\nH " + randomNumber);  
                 System.out.println("\nNumber of Heads: " + numberOfHeads);
                 
                 
             }  
               
               
         }  
          
         
           
     }  
}   

it still isnt quite working correctly. im sure it is my own fault for making this more difficult than it is, but the program is supposed to ask me for the number of flips, it is supposed to output something like this,
Program Output

[Miklos Szeles]

Just think about what you want. You wolud like to write out whether a tail or a head is flipped and you wolud like to write out the random number for every flip. But what about the number of tails and number of heads? Do you really want to print them out after every flip? I don't think so. So the only thing to do is to put the code which prints the number of heads and tails to the end of the program.